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The National Weather Service issued blizzard warnings for parts of Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine and Vermont.

According to the airline-tracking website FlightAware, more than 5,000 flights Tuesday were canceled, including more than 2,800 in the New York City area, where about 200 passengers were stranded at John F. Kennedy airport. Amtrak also canceled and modified service up and down the Northeast Corridor. In New York City, the above-ground portions of the subway system were being shut down Tuesday morning.

Massachusetts is bracing for as much as 2 feet of snow in some areas.

Winter Storm and Blizzard warnings are in effect for much of the state, including Boston, Worcester and Springfield.

"There will be treacherous travel at times today, especially during the height of the storm when it will be most intense between 10 a.m. and 4 p.m. this afternoon," WCVB’s Cindy Fitzgibbon said.

Snow begins to move into the area from the southwest overnight, reaching Boston during the morning commute. The heaviest snow will begin around 9 a.m. and persist until about 5 p.m. Combined with winds, this creates the potential for blizzard conditions.

"At that time, snowfall rates of 2 to 4 inches per hour are possible, and we could be talking about thunder snow as well. So heavy snow, treacherous travel -– these are the big impacts for today," Fitzgibbon said.

Because the snow will be heavy and wet, coupled with strong winds that could gust up to 60 mph in some parts, power outages aren't out of the question.

The storm will have a mix line that will keep snowfall totals down for coastal areas. "That mix may get all the way up to Boston or beyond for a little while into (Tuesday) evening," WCVB Chief Meteorologist Harvey Leonard said. The storm is expected to stay in the area for much of Tuesday and when all is said and done, over a foot of snow can accumulate for a large portion of Massachusetts.

Portions of Pennsylvania are being hammered by the storm, with Gov. Tom Wolf placing speed restrictions on some highways in the eastern part of the state. Snow emergencies have been declared in several cities, including Lancaster, Harrisburg, York and Lebanon.

Snow totals were already reaching close to six inches by Tuesday morning. Widespread heavy snow is expected to fall until 10 a.m., at a rate of 1-3 inches per hour.

Maine could see a higher amount of snow Tuesday, with 16-22 inches predicted to fall along the coast and inland areas. The foothills and mountains could see 12-16 inches. Next door, New Hampshire is also bracing for heavy snow, where snowfall rates could be 2-3 inches per hour. Some areas could pickup 2 feet of snow by the time the storm makes it’s way out of the area.

In Baltimore, the snowfall has turned to sleet in some areas, as the snow begins to melt when it falls to the ground.

The National Weather Service issued a Winter Weather Advisory that will be in effect until 2 p.m. for much of the central Maryland, including much of Baltimore, Howard and Montgomery counties. A Winter Storm Warning remains in effect until 2 p.m. for parts of Baltimore County, along with Caroll, Harford and Frederick counties and western Maryland.

A wind advisory takes effect for the lower Eastern Shore from 6 a.m. to 1 p.m. Tuesday. Wind gusts could exceed 30 mph. On Monday, Maryland Governor Larry Hogan declared state of emergency in the state.